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You searched for: creator:"Ronald"
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[audio]hsbirthday2001Piste 8 - ronald
hsbirthday20001ronald
Keywords: jeev
Downloads: 151
[audio]Demo (Examen) - RONALD
DEMO SOBRE LEYES DE NEWTON PARA EL EXAMEN DE COMPUTACION
Keywords: Demo; computacion; examen
Downloads: 8
[image]Glij 'm d'r in - Ronald

Downloads: 26
[audio]GARY TALK - RONALD
FUN
Keywords: D
Downloads: 29
[image]Gezelligheid tot sluitingstijd - Ronald

Downloads: 35
[audio]separor - ronald
wejnfoiwehfwqehf
Keywords: rwfifgi
Downloads: 3
[image]Geil moet ze zijn - Ronald

Downloads: 43
[texts]1991 1992 Official Congressional Directory 102 D Congress - Ronald

Downloads: 13,925
[audio]SALSA CRIMINETTION - RONALD
SALSA ROMANTICA
Keywords: DJKEILERYBONGO
Downloads: 638
[texts]Rational Blowdowns of Smooth 4-Manifolds - Ronald Fintushel
In this paper we introduce a surgical procedure, called a rational blowdown, for a smooth 4-manifold X and determine how this procedure affects both the Donaldson and Seiberg-Witten invariants of X.
Downloads: 3
[texts]The blowup formula for Donaldson invariants - Ronald Fintushel
In this paper we present a formula which relates the Donaldson invariants of a 4-manifold X with the Donaldson invariants of its blowup X#-CP(2). This blow-up formula is independent of X and involves sigma-functions associated to a naturally arising elliptic function. This, the final version, corrects some earlier misconceptions regarding signs.
[texts]Effect of nitrogen source on rumen pH, ammonia, total and protein nitrogen - Abe, Ronald (Ronald Kuraso)
This volume was digitized and made accessible online due to deterioration of the original print copy.
Keywords: Rumen; Nitrogen in animal nutrition
Downloads: 29
[texts]Wireability of an ultracomputer - Bianchini, Ronald

Downloads: 96
[texts]Covering morphisms of groupoids, derived modules and a 1-dimensional Relative Hurewicz Theorem - Ronald Brown
We fill a lacuna in the literature by giving a version in dimension 1 of the Relative Hurewicz Theorem, and relate this to abelianisations of groupoids, covering spaces and covering morphisms of groupoids, and Crowell's notion of derived modules.
[audio]Podcast from Cisco Live! Africa - Ronald Bartels
A podcast from Cisco Live! Africa 2008. A Thinking Problem Management! podcast.
Keywords: Thinking problem management; podcast; Cisco
Downloads: 111
[texts]Fractal rain distributions and chaotic advection - Ronald Dickman
Localized rain events have been found to follow power-law distributions over several decades, suggesting parallels between precipitation and seismic activity [O. Peters et al., PRL 88, 018701 (2002)]. Similar power laws can be generated by treating raindrops as passive tracers advected by the velocity field of a two-dimensional system of point vortices [R. Dickman, PRL 90, 108701 (2003)]. Here I review observational and theoretical aspects of fractal rain distributions and chaotic advection, and...
[texts]The dynamics of planned change; a comparative study of principles and techniques - Lippitt, Ronald
Includes bibliography
Keywords: Change (Psychology); Life Change Events; Social Change; Changement (Psychologie); Planning of change
Downloads: 16
[texts]Luncheons: A Cook's Picture Book : a Supplement to the Century Cook Book - Mary Ronald
Book digitized by Google from the library of Harvard University and uploaded to the Internet Archive by user tpb.
Downloads: 62
[texts]Computing Homotopy Types Using Crossed N-Cubes of Groups - Ronald Brown
The aim of this paper is to explain how, through the work of a number of people, some algebraic structures related to groupoids have yielded algebraic descriptions of homotopy n-types. Further, these descriptions are explicit, and in some cases completely computable, in a way not possible with the traditional Postnikov systems, or with other models, such as simplicial groups.
Downloads: 2
[texts]Structure Factor of the 3D Random Field XY Model - Ronald Fisch
We have performed Monte Carlo studies of the 3D random field XY model on $L \times L \times L$ simple cubic lattices, with random field strengths of $h_r$ = 1 and 2. We present results for the angle-averaged magnetic structure factor, $S (k)$ at $L = 64$. Our results appear to indicate a phase transition into a ferromagnetic state. This is made possible by the existence of a Griffiths singularity. It appears that at the phase transition $M^2$ jumps to zero discontinuously, with a latent heat whi...
Downloads: 1
[texts]Power-law correlations and orientational glass in random-field Heisenberg models - Ronald Fisch
Monte Carlo simulations have been used to study a discretized Heisenberg ferromagnet (FM) in a random field on simple cubic lattices. The spin variable on each site is chosen from the twelve [110] directions. The random field has infinite strength and a random direction on a fraction x of the sites of the lattice, and is zero on the remaining sites. For x = 0 there are two phase transitions. At low temperatures there is a [110] FM phase, and at intermediate temperature there is a [111] FM phase...
Downloads: 1
[texts]Nonabelian Algebraic Topology - Ronald Brown
This talk gave a sketch of the contents and background to a book with the title `Nonabelian algebraic topology' being written under support of a Leverhulme Emeritus Fellowship (2002-2004) by the speaker and Rafael Sivera (Valencia). The aim is to give in one place a full account of work by R. Brown and P.J. Higgins since the 1970s which defines and applies crossed complexes and cubical higher homotopy groupoids in algebraic topology and group cohomology.
Downloads: 4
[texts]Nonuniversality and critical point shift in systems with infinitely many absorbing configurations - Ronald Dickman
A detailed study of critical spreading in the one-dimensional pair contact process is performed using a recently devised reweighting method. The results confirm the validity of a generalized hyperscaling relation among the (nonuniversal) spreading exponents, and support the assertion that the critical point location does not depend on the particle density \phi. It appears that the exponents z and delta+eta, once thought to be invariant, exhibit a systematic dependence on \phi.
Downloads: 2
[texts]Finite-Size Scaling Critical Behavior of Randomly Pinned Spin-Density Waves - Ronald Fisch
We have performed Monte Carlo studies of the 3D $XY$ model with random uniaxial anisotropy, which is a model for randomly pinned spin-density waves. We study $L \times L \times L$ simple cubic lattices, using $L$ values in the range 16 to 64, and with random anisotropy strengths of $D / 2 J$ = 1, 2, 3, 6 and $\infty$. There is a well-defined finite temperature critical point, $T_c$, for each these values of $D / 2 J$...
Downloads: 1
[texts]An Improved Limit on the Electric Dipole Moment of the Muon - Ronald McNabb
Data from the muon g-2 experiment at Brookhaven National Lab has been analyzed to search for a muon electric dipole moment(EDM), which would violate parity and time reversal symmetries. An EDM would cause a tilt in the spin precession plane of the muons, resulting in a vertical oscillation in the position of electrons hitting the detectors. No signal has been observed. Based on this analysis, an improved limit of $2.8 \times 10^{-19} e-cm(95% CL) is set on the muon EDM.
Downloads: 2
[texts]The Deformation Complex For DG Hopf Algebras - Ronald Umble
Let H be a differential graded Hopf algebra over a field k. This paper gives an explicit construction of a triple cochain complex that defines the Hochschild-Cartier cohomology of H. A certain truncation of this complex is the appropriate setting for deforming H as an H(q)-structure. The direct limit of all such truncations is the appropriate setting for deforming H as a strongly homotopy associative structure...
Downloads: 1
[texts]Structure Relations in Special A_\infty-bialgebras - Ronald Umble
We compute the structure relations in special A_\infty-bialgebras whose operations are limited to those defining the underlying A_\infty-(co)algebra substructure. Such bialgebras appear as the homology of certain loop spaces. Whereas structure relations in general A_\infty-bialgebras depend upon the combinatorics of permutahedra, only Stasheff's associahedra are required here.
Downloads: 3
[texts]A note on evolutionary stochastic portfolio optimization and probabilistic constraints - Ronald Hochreiter
In this note, we extend an evolutionary stochastic portfolio optimization framework to include probabilistic constraints. Both the stochastic programming-based modeling environment as well as the evolutionary optimization environment are ideally suited for an integration of various types of probabilistic constraints. We show an approach on how to integrate these constraints. Numerical results using recent financial data substantiate the applicability of the presented approach.
Downloads: 2
[texts]Power-law correlated phase in random-field XY models and randomly pinned charge-density waves - Ronald Fisch
Monte Carlo simulations have been used to study the Z6 ferromagnet in a random field on simple cubic lattices, which is a simple model for randomly pinned charge-density waves. The random field is chosen to have infinite strength on a fraction x of the sites of the lattice, and to be zero on the remaining sites. For x= 1/16 there are two phase transitions. At low temperature there is a ferromagnetic phase, which is stabilized by the six-fold nonrandom anisotropy...
Downloads: 2
[texts]Finite-Size Scaling of the Domain Wall Entropy Distributions for the 2D $\pm J$ Ising Spin Glass - Ronald Fisch
The statistics of domain walls for ground states of the 2D Ising spin glass with +1 and -1 bonds are studied for $L \times L$ square lattices with $L \le 48$, and $p$ = 0.5, where $p$ is the fraction of negative bonds, using periodic and/or antiperiodic boundary conditions. When $L$ is even, almost all domain walls have energy $E_{dw}$ = 0 or 4. When $L$ is odd, most domain walls have $E_{dw}$ = 2...
Downloads: 2
[texts]Supernova Detection in IceCube: Status and Future - Ronald Bruijn
The IceCube detector, located at the South Pole, is discussed as a detector for core collapse supernovae. The large flux of $\bar{\nu}_{e}$ from a Galactic supernova gives rise to Cherenkov light from positrons and electrons created in neutrino interactions which increase the overall count rate of the photomultipliers significantly. We will give an overview of the standard, count rate based, method for supernova detection and present the development of a novel technique...
Downloads: 1
[texts]Crossed complexes and homotopy groupoids as non commutative tools for higher dimensional local-to-global problems - Ronald Brown
We outline the main features of the definitions and applications of crossed complexes and cubical $\omega$-groupoids with connections. These give forms of higher homotopy groupoids, and new views of basic algebraic topology and the cohomology of groups, with the ability to obtain some non commutative results and compute some homotopy types.
Downloads: 1
[texts]Evidence of Long Range Order in the Riemann Zeta Function - Ronald Fisch
We have done a statistical analysis of some properties of the contour lines Im$(\zeta (s))$ = 0 of the Riemann zeta function. We find that this function is broken up into strips whose average width on the critical line does not appear to vary with height. We also compute the position of the primary zero for the lowest 200 strips, and find that this probability distribution also appears to be scale invariant.
Downloads: 2
[texts]Numerical analysis of the master equation - Ronald Dickman
Applied to the master equation, the usual numerical integration methods, such as Runge-Kutta, become inefficient when the rates associated with various transitions differ by several orders of magnitude. We introduce an integration scheme that remains stable with much larger time increments than can be used in standard methods. When only the stationary distribution is required, a direct iteration method is even more rapid; this method may be extended to construct the quasi-stationary distribution...
Downloads: 4
[texts]Duality theory for Markov processes: Part 1 - Ronald Getoor
This is the first part of a possible monograph on the duality of Markov processes. It contains a proof of Fitzsimmons' existence theorem of a moderate Markov dual process relative to an excessive measure, m, together with the necessary preliminary material. Then this is applied to prove the correspondence between optional copredictable homogenous random measures and sigma finite measures not charging m-exceptional sets again following Fitzsimmons...
Downloads: 3
[texts]Contact process with mobile disorder - Ronald Dickman
I study the absorbing-state phase transition in the one-dimensional contact process with mobile disorder. In this model the dilution sites, though permanently inactive, diffuse freely, exchanging positions with the other sites, which host a basic contact process. Even though the disorder variables are not quenched, the critical behavior is affected: the critical exponents delta and z, the ratio beta/nu_perp and the moment ratio m= /rho^2 take values different from those of directed percolation, ...
Downloads: 2
[texts]N-Site approximations and CAM analysis for a stochastic sandpile - Ronald Dickman
I develop n-site cluster approximations for a stochastic sandpile in one dimension. A height restriction is imposed to limit the number of states: each site can harbor at most two particles (height z_i \leq 2). (This yields a considerable simplification over the unrestricted case, in which the number of states per site is unbounded.) On the basis of results for n \leq 11 sites, I estimate the critical particle density as zeta_c = 0.930(1), in good agreement with simulations...
Downloads: 2
[texts]Moore hyperrectangles on a space form a strict cubical omega-category - Ronald Brown
A question of Jack Morava is answered by generalising the notion of Moore paths to that of Moore hyperrectangles, so obtaining a strict cubical omega-category. This also has the structure of connections in the sense of Brown and Higgins, but cancellation of connections does not hold.
Downloads: 2
[texts]Three themes in the work of Charles Ehresmann: Local-to-global; Groupoids; Higher dimensions - Ronald Brown
This paper illustrates the themes of the title in terms of: van Kampen type theorems for the fundamental groupoid; holonomy and monodromy groupoids; and higher homotopy groupoids. Interaction with work of the writer is explored.
Downloads: 2
[texts]The matrix element for radiative Bhabha scattering in the forward direction - Ronald Kleiss
We present an approximation to the matrix element for the process e+e- --> e+e-gamma, appropriate to the situation where one or both of the fermions are scattered over very small angles. The leading terms in the situation where all scattering angles are small contains not only terms quadratic in the electron mass, but also quartic and even sextic terms must be included. Special attention is devoted to the numerical stability of the resultant expression...
Downloads: 2
[texts]A new higher homotopy groupoid: the fundamental globular omega-groupoid of a filtered space - Ronald Brown
We use the n-globe with its skeletal filtration to define the fundamental globular omega--groupoid of a filtered space; the proofs use an analogous fundamental cubical omega--groupoid due to the author and Philip Higgins. This method also relates the construction to the fundamental crossed complex of a filtered space, and this relation allows the proof that the crossed complex associated to the free globular omega-groupoid on one element of dimension n is the fundamental crossed complex of the n...
Downloads: 2
[texts]Finite-size scaling of the Domain Wall Entropy for the 2D \pm J Ising Spin Glass - Ronald Fisch
The statistics of domain walls for ground states of the 2D Ising spin glass with +1 and -1 bonds are studied for $L \times L$ square lattices with $L \le 20$, and $x$ = 0.25 and 0.5, where $x$ is the fraction of negative bonds, using periodic and/or antiperiodic boundary conditions. Under these conditions, almost all domain walls have an energy $E_{dw}$ equal to 0 or 4. The probability distribution of the entropy, $S_{dw}$, is found to depend strongly on $E_{dw}$...
Downloads: 2
[texts]Muon Collider: Plans, Progress and Challenges - Ronald Lipton
We in the physics community expect the LHC to uncover new physics in the next few years. The character and energy scale of the new physics remain unclear, but it is likely that data from the LHC will need to be complemented by information from a lepton collider which can provide for precise examination of new phenomena. We describe the concept, accelerator design, and detector R&D for a high energy Muon Collider as well as the challenges associated with the machine and its detector environment.
Downloads: 2
[texts]Embeddability of Arrangements of Pseudocircles into the Sphere - Ronald Ortner
An arrangement of pseudocircles is a finite set of oriented closed Jordan curves each two of which cross each other in exactly two points. To describe the combinatorial structure of arrangements on closed orientable surfaces, in (Linhart, Ortner 2004) so-called *intersection schemes* were introduced. Building up on results about the latter, we first clarify the notion of embedding of an arrangement...
Downloads: 2
[texts]Nonequilibrium Phase Transitions in Epidemics and Sandpiles - Ronald Dickman
Nonequilibrium phase transitions between an active and an absorbing state are found in models of populations, epidemics, autocatalysis, and chemical reactions on a surface. While absorbing-state phase transitions fall generically in the DP universality class, this does not preclude other universality classes, associated with a symmetry or conservation law. An interesting issue concerns the dynamic critical behavior of models with an infinite number of absorbing configurations or a long memory...
Downloads: 2
[texts]Combinations and Mixtures of Optimal Policies in Unichain Markov Decision Processes are Optimal - Ronald Ortner
We show that combinations of optimal (stationary) policies in unichain Markov decision processes are optimal. That is, let M be a unichain Markov decision process with state space S, action space A and policies \pi_j^*: S -> A (1\leq j\leq n) with optimal average infinite horizon reward. Then any combination \pi of these policies, where for each state i in S there is a j such that \pi(i)=\pi_j^*(i), is optimal as well...
Downloads: 2
[texts]A topologically induced 2-in/2-out operation on loop cohomology - Ronald Umble
We apply the Transfer Algorithm introduced in arXiv:1106.5090 to transfer an A_\infty-algebra structure that cannot be computed using the classical Basic Perturbation Lemma. We construct a space X whose (base pointed) loop cohomology H = H^*(\Omega X; Z_2) comes equipped with a nontrivial operation \omega : H x H --> H x H.
Downloads: 2
[texts]Double groupoids, matched pairs and then matched triples - Ronald Brown
In this note we show that the known relation between double groupoids and matched pairs of groups may be extended, or seems to extend, to the triple case. The references give some other occurrences of double groupoids.
Downloads: 2
[texts]Local behaviour of first passage probabilities - Ronald Doney
Suppose that S is an asymptotically stable random walk with norming sequence c_{n} and that T_{x} is the time that S first enters (x,\inf), where x\ge 0. The asymptotic behaviour of P(T_0=n) has been described in a recent paper of Vatutin and Wachtel, \cite{vw}, and here we build on that result to give three estimates for P(T_{x}=n), which hold uniformly as n\to\inf in the regions x=o(c_{n}), x=O(c_{n}), and x/c_{n}\to\inf, respectively.
Downloads: 2
[texts]Random Field Models for Relaxor Ferroelectric Behavior - Ronald Fisch
Heat bath Monte Carlo simulations have been used to study a four-state clock model with a type of random field on simple cubic lattices. The model has the standard nonrandom two-spin exchange term with coupling energy $J$ and a random field which consists of adding an energy $D$ to one of the four spin states, chosen randomly at each site. This Ashkin-Teller-like model does not separate; the two random-field Ising model components are coupled...
Downloads: 1
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